| Multiple facets of Arabidopsis seedling development require indole-3-butyric acid-derived auxin. | |
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MedLine Citation:
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PMID: 21406624 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Levels of auxin, which regulates both cell division and cell elongation in plant development, are controlled by synthesis, inactivation, transport, and the use of storage forms. However, the specific contributions of various inputs to the active auxin pool are not well understood. One auxin precursor is indole-3-butyric acid (IBA), which undergoes peroxisomal β-oxidation to release free indole-3-acetic acid (IAA). We identified ENOYL-COA HYDRATASE2 (ECH2) as an enzyme required for IBA response. Combining the ech2 mutant with previously identified iba response mutants resulted in enhanced IBA resistance, diverse auxin-related developmental defects, decreased auxin-responsive reporter activity in both untreated and auxin-treated seedlings, and decreased free IAA levels. The decreased auxin levels and responsiveness, along with the associated developmental defects, uncover previously unappreciated roles for IBA-derived IAA during seedling development, establish IBA as an important auxin precursor, and suggest that IBA-to-IAA conversion contributes to the positive feedback that maintains root auxin levels. |
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Authors:
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Lucia C Strader; Dorthea L Wheeler; Sarah E Christensen; John C Berens; Jerry D Cohen; Rebekah A Rampey; Bonnie Bartel |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2011-03-15 |
Journal Detail:
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Title: The Plant cell Volume: 23 ISSN: 1532-298X ISO Abbreviation: Plant Cell Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-04-27 Completed Date: 2011-08-15 Revised Date: 2013-05-24 |
Medline Journal Info:
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Nlm Unique ID: 9208688 Medline TA: Plant Cell Country: United States |
Other Details:
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Languages: eng Pagination: 984-99 Citation Subset: IM |
Affiliation:
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Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 77005, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Arabidopsis
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growth & development*,
metabolism Arabidopsis Proteins / metabolism Cell Division Chromosome Mapping Enoyl-CoA Hydratase / metabolism Indoleacetic Acids / metabolism* Indoles / metabolism* Mutation Phylogeny Plant Growth Regulators / metabolism* Plant Roots / cytology, growth & development, metabolism Seedling / drug effects, growth & development* |
| Grant Support | |
ID/Acronym/Agency:
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1K99-GM089987/GM/NIGMS NIH HHS; S10 RR026399/RR/NCRR NIH HHS; S10 RR026399-01/RR/NCRR NIH HHS; //Howard Hughes Medical Institute |
| Chemical | |
Reg. No./Substance:
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0/Arabidopsis Proteins; 0/Indoleacetic Acids; 0/Indoles; 0/Plant Growth Regulators; 061SKE27JP/indolebutyric acid; 6U1S09C61L/indoleacetic acid; EC 4.2.1.17/ECH2 protein, Arabidopsis; EC 4.2.1.17/Enoyl-CoA Hydratase |
| Comments/Corrections | |
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